CONTROLS AND INSTRUMENTS 4-39
PA1628 H3-41, H3-45 Operator’s Manual
STOP telltale light
WARNING
The driver is responsible for monitoring the pressure as
part of a regular sweep of the instruments.
In the event of a pressure loss in the primary brake
system, the drive and tag axle service brakes will not
function normally. It is critical to bring the coach to a
safe stop as quickly as possible.
If there is sufficient pressure in the secondary brake
system, modulated spring brake pressure (using the park
brake chambers) will be used to apply the drive axle
brakes, proportional to the braking pressure on the front
axle. It must be noted this is an emergency situation and
a significant amount of secondary air pressure is lost with
each apply/release cycle. The spring brake modulation
will only function two or three times, depending on the
amount of secondary air pressure that was on hand when
the primary brake pressure was lost.
Once the secondary air pressure drops below 60 psig, the
park spring brakes are fully applied and cannot be
released until pressure is restored.
Do not drive the coach when the brake air pressure is low.
DEF level
06735
Indicates the amount of DEF (Diesel Exhaust Fluid) remaining
in the DEF tank. The DEF tank is considered as being full when it
contains 16 gallons (60 liters) of DEF. DEF consumption will be
approximately 2% of the diesel fuel consumed.
CAUTION
DEF will begin to crystallize and freeze at 12°F (-11°C). DEF
expands by approximately 7% when frozen. In order to
permit DEF expansion without causing damages to the
DEF tank, do not fill the DEF tank with more than 16
gallons (60 liters).
Summary of Contents for H 2018 Series
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